Smoke detector



FIG. 1 is a front, left side perspective view of a smoke detector showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front perspective view thereof with the hanger in its extended position. 

The ornamental design for a smoke detector, substantially as shown and described. 